This process is going to clean up some of the tools we have used.
Open OTL.exe click on the cleanup button. You will be asked to reboot.
Please do so now to clean up some tools.
SpywareBlaster will add a large list of programs and sites to your Browser settings that will protect you from accidentally running or downloading known malicious programs.
After the installation, click Download Latest Protection Updates. When it finishes, click Enable All Protection.
Always watch closely to any software your installing.
If they want to install something more than their program stop right there and investigate what it is they want to place on your computer.
If they give you the option not to install it choose that until you investigate it completely.
The more you install that you don't want or need the more you'll wish you didn't.
Heres a list of good sites that might be able to help you for a sluggish machine.
Slow computer help MWR
Tech support forums XP
What the tech Windows
Bleeping Computer Windows XP Home and Professional
Safe and Happy Surfing.